Spring handle attachment for rock drills



Feb. 16, 1932. w. H. BENEDICT 1,845,825

SPRING' HANDLE ATTACHMENT FOR ROCK DRILLS Filed July 22. '1927 ATTORNEY.

Fill

, simplify the construction Patented Feb. 16, 1932 UNITED STATES PATENT OFFICE WILLIAM H. BENEDICT, OF COBCOB,

A CORPORATION OF NEW JERSEY SPRING HANDLE ATTACHMENT FOR ROCK DRILLS Application med July 22,

This invention relates to handle attachments adapted for use with rock drills of the cradle or shell mounted type.

Among the objects of the invention are to and to cheapen the cost of manufacture of such attachments, to permit the convenient application of the attachment to a drill of the described type, to confine the wear to extended bearing surfaces engaging the wing portions or projecting flanges of the drill, and in general to improve prior devices in theinterest of more efficient and satisfactory service.

` In order to illustrate the invention one concrete embodiment thereofis shown in the accompanying drawings in which:

Fig. 1 is a plan view of a drill with the handle attachment applied thereto;

Fig. 2 is a right end elevational view of .1 the parts shown in Fig. 1;

Fig. 3 is a side view showing the drill in elevation save for the feed nut projection which is in section and showing the attachment in section substantially on the line 3-3 of Fig. l;

Fig. fl: is a fragmentary transverse sectional view substantially on the line b4 of Fig. 3; and

Fig. 5 is a detail View showing a slight modification.

In the drawings the attachment is disclosed asapplied to a drill A of the cradle or shell mountedptype having on its lower side the Wings or projecting flanges a (Figs. 1, 2 and 4) adapted to engage the slides of the shell mounting and the usual feed nut projection b (Figs. 1, 2 and 3).

The handle attachment includes a block 6 which may be either a. casting or a forging.

V It is of such shape as to span the shell engag ing portions of drill A, (see Fig. 4) and has axial recesses 7 slidably receiving wings a of the drill. Block G carries a handle 8 secured thereto in any suitable manner as by rods 9 having reduced ends extending through aligned perforated ears 6a, 6b, nuts 10 being utilized to prevent Withdrawal of the rods, which may extend beyond nuts 10 as indicated in Fig. 1 for a purpose later to be described. As indicated in Figs. 2 and 3 1927. serial no. 207,611.`

rods 9 may be bent so as to dispose handle S in line with the axis of the drill.

The handle attachment is arranged for limited yielding movement axially of the drill in both directions to protect the operator of the drill from the vibration` of the latter when in operation. The feed nut projection b is utilized to fix the midpoint of such permissive movement and` to form a j j CONNECTICUT, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y.,

ist

of the springs provide guide for centering members for the latter. `For this purpose abutment Walls 11 and 12 may provide projections 11a and 12a.` The centeringmeans in relation to feed nut projection b prefcrably'takes the formof socket `or cupmem bers 15 projecting Within the bore of thefeed nut projection and in these sockets the ends of the springs are seated. This arrangement not only accurately centers the `springs but also permits the entire attachment either to be madequite compact or to use long springs or both, `since practically the entire bore of feed nut projection b is made available for a useful purpose. l

To enable the attachment to be applied to a drill, one abutment Wall, such as 1Q, is made separable from block 6, preferably being part of a cap piece 16 which is clamped to block 6. For the purpose ot' securing the cap piece in place the extended ends of side rods 9 may be used as indicated in Fig. 1, the rods passing through ears 18a and 186 on cap piece 18 and having Washers 19 and nuts 20 applied toy their outer ends. Fig. 5

indicates an alternative construction in which Y handle :attachment removable abutment through a single elongate ear on the block 6.

cap piece 18 is then with the end of bloc-k 6 to confine spring 14 on= the opposite side 2 of" the feed. nut projection, the ends of rods 9 extending through ears 18a andi 182;.. Tashers- 19V andnuts 2O are applied. This completes the attaching ofthe spring Vhandle and the drill isready for 'use'as a manually supportedltool. The

isV quickly removed by reversingthe above steps.

While the invention has been her-ein disclosed inwhat are now considered to be preferredforms, it is to be understoodthat the invention is not limited to the specific details thereon.. buty covers all: changes, modifica tions and, adaptations within the scope of the appended claims; v Y. Y

I'claim` as my Ainvention 1i. The combination with a drill of the cradle vor shell mounted type v of ka handle `attachment therefor` having portions slidably fittingA thefshelllv engagingV portions of the drill and providinga fixed abut-ment and a removable abutment disposed. on. opposite sides of the feed nutprojeotion ofthe drill, and in line with they vaxis of the latter, springs interposed between saidV abutments and the. feed'nut projection and comprising the sole connection betweenl saidv attachment and said; feed nut projection, and: centering means onvsaid feed nut" projection for said springs telescopingly supportingthe latter w-ithin'the bore of said projection.

2.'The combination withy a drill ofthe cradle o r shell mounted type of'af handle at,- tachmentr therefor'having portions slidably fitting the shell engagingl portions of the drill" and.l providing a fixed abutment and a disposed on opposite sidesrofthe feed nut j and Vin: line with the. axis of the latter, coi-lfsprings interposed between said abutmentsand the feednut projection, andcomprising-the sole connection between said attachment and said feed nut projection, and centeringmeans forsaid springs on both -said abut-mentsand said projection, said projection centering means disposing a portion of one. of said springs within the bore `of said projection'. s

3.. rIlhecombination with a drillV of the cradle or shell mounted typeof a handle atprojection ZIA until thefreeendof spring 13 telescopes over guide projection 11a.. Blockdisforcedstill further forward to` compress spring 13 and pla-ced in engagement projection ofthe drill,

tachment therefor having portions slidably fitting the shell engaging'portions of the drill and providing opposing abutments disposed on-opposite sides of the feed nut projection of the drill and in line with the axis of the latter, one of saidabutments being detachable to permit application:- and removal of said attachment, coil springs interposed between said abutments and the feed nut projection, socket on cup'members atv tlieend's ofV they feed nut projectionextendingat least partly withinthe bore of the same, one end of each of saidtsprings being received by said membersto. maintain the springs in place.

1. AThe combination with a drill of the cradle or shell mounted type of a handle attachmentv therefor comprising` a' blockV ar,-

ranged to span theloiver` portionofthefv drill andA having recesses slidably receiving the -wings or projectingy `flanges of' the drill, said block having at its ends -transversefabutments disposed in line with thel axis of. the feed nut projection ofi the drill,v oneof. said abut-ments being ldetachable from lsaidy block to permit application and removal of theattachment, socket members in the-feed nut projection of thedrill, and coilrspringsfengaging said members ontheone hand and said abutments on the other to permit limited yielding movement of the handle relative` to the drill axially inboth directions torelieve the operator'of shocks. n

5. A spring, handle attachment fordrills of the cradleor shell mounted type comprising a block having recessesslidably to receive the wings or'projectingfflanges of thedrill, said block having a'ftransverseabutment wall integral therewith andfarrangedlto be disposed in line withV the aX-isof. the feed4 nut projection of the drill, a cap member releas- Y ably secured to said block providing asecond abutment wall opposed to and spacedf from saidy first wall, inwardly directedY centering projections on said abutment. walls,and coil springs for interposition between saidfV abut.- ment walls andthe feed nut` projection ofthe drill and forengagementcwithsaid centering projections.Y 'i

Signedlby me at New. Yorkcity,'NeW York this 13th day of July, 1927.

WILLIAMk H. BnNnDior.. 

